It's pretty easy to control an RS232 channel from the comfort of your Hog.
Here's the Hog 2 library for doing this.

Hugh

//-------------------------------------------------------
fixture = Cat SC
manufacturer = 2
product = 59
name = Cat v3 Serial

output = dmx

parameter = Control
default = 0
highlight = 0
crossfade = 1
type = ltp8bit
range = 0, no slot, noauto
range = 6, slot 1, noauto
range = 31, slot 2, noauto
range = 56, slot 3, noauto
range = 81, slot 4, noauto
range = 106, slot 5, noauto
range = 131, slot 6, noauto
range = 156, slot 7, noauto
range = 181, slot 8, noauto
range = 206, slot 9, noauto
range = 231, slot 10, noauto